[Refactor] Add WEIGHT_SYNC_TIMEOUT constant for collector weight synchronization

[vmoens]

Stack from ghstack (oldest at bottom):

• [Feature] Add _Contiguous module and reshape improvements to encoders/decoders #3306
• [BugFix] Fix SliceSampler for torch.compile compatibility #3298
• [Feature] Refactor Dreamer training with async collectors, profiling, and improved config #3308
• [Feature] Add noise argument and scan mode to RSSMRollout #3307
• [Feature] Add explicit dimensions and device support to RSSM modules #3305
• [Refactor] Use compile-aware helpers in Dreamer objectives #3304
• [BugFix] Fix value functions for torch.compile compatibility #3303
• [BugFix] Fix TDLambdaEstimator for torch.compile compatibility #3302
• [BugFix] Optimize DreamerEnv to avoid CUDA sync in done checks #3301
• [Feature] Add allow_done_after_reset parameter to ModelBasedEnvBase #3300
• [BugFix] Fix ModelBasedEnvBase for torch.compile compatibility #3299
• [Refactor] Add compile-aware timing and profiling helpers #3297
• [Feature] Support callable scale in IndependentNormal and TanhNormal distributions #3296
• [Refactor] Use non_blocking transfers in distribution modules #3295
• -> [Refactor] Add WEIGHT_SYNC_TIMEOUT constant for collector weight synchronization #3294
• [Refactor] Remove MUJOCO_EGL_DEVICE_ID auto-setting from torchrl init #3293

Add configurable timeout constant (default 120s) for weight sync operations,
configurable via TORCHRL_WEIGHT_SYNC_TIMEOUT environment variable.
This helps when using many collectors across different CUDA devices.

[pytorch-bot]

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❌ 3 New Failures, 13 Pending, 1 Unrelated Failure

As of commit e8fb516 with merge base df00d61 ():

NEW FAILURES - The following jobs have failed:

• Habitat Tests on Linux / tests (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 50e64fdfba3cc39a171065e2d2f03070c8822ad73e7ab93370fe55ed2919cdb9 /exec failed with exit code 1
• Libs Tests on Linux / unittests-gym (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t e8d2ab5c3b904aa9587bd701fd0585e75bfc5127af9986d4c744ea955574442c /exec failed with exit code 1
• Lint / python-source-and-configs / linux-job (gh)

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Unit-tests on Linux / tests-cpu (3.14) / linux-job (gh) (trunk failure)
  test/test_transforms.py::TestConditionalSkip::test_trans_parallel_env_check[False-False]

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